SH7619_09 Datasheet, PDF (255/860 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7619 Series

Section 9 Watchdog Timer (WDT)
Section 9 Watchdog Timer (WDT)
This LSI includes the watchdog timer (WDT) that can reset this LSI by the overflow of the
counter when the value of the counter has not been updated because of a system runaway.
The WDT is a single-channel timer that uses a peripheral clock as an input and counts the clock
settling time when leaving software standby mode and temporary standby state, such as frequency
changes. It can also be used as an interval timer.
9.1 Features
The WDT has the following features:
• Can be used to ensure the clock settling time.
The WDT can be used when leaving software standby mode and the temporary standby state
which occur when the clock frequency is changed.
• Can switch between watchdog timer mode and interval timer mode.
• Internal resets in watchdog timer mode
Internal resets are generated when the counter overflows.
• Interrupts are generated in interval timer mode
Interval timer interrupts are generated when the counter overflows.
• Choice of eight counter input clocks
Eight clocks (×1 to ×1/4096) that are obtained by dividing the peripheral clock can be chosen.
Rev. 6.00 Jul. 15, 2009 Page 215 of 816
REJ09B0237-0600